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Vehicle is long gone but that would not have made a difference. I had taken many mountain trips in the past with the same wheel tire set up. This was some new problem. They never were able to fix it.

Thanks for all the information and suggestions. I took it to a second dealership who found a loose intake hose that the first dealer (who fixed the HPFP issue) either failed to secure or knocked loose. Additionally, Jeep sent a Field Service Tech to look at and drive the vehicle. He checked out...

Wow, very nice!

Thanks Dylan. I brought it to a different dealership, which is owned by my friend. I think they will put in some more effort. The service record / receipt says the code was C121C-00 but I Googled that and it doesn't seem to match what they told me about the turbo temp.

The dealership suggested the aftermarket oil cooler (in writing) and the AutoNation Carlsbad Jeep service manager relayed that recommendation to Jeep Customer Service, but when I picked up the vehicle there was no mention of it on the service record. The more I think about it the more I'm...

Thank you, the dealer said they did check that

By the way, I’ve gone on many long trips, including Mammoth Mountain, etc. with much steeper longer grades, same tires. No issue. This is a new problem. I think the dealership is just punting on diagnosing and fixing it.

I suppose all I would need to do is put the stock tires back and tow a trailer. Not prepared to go through that exercise!

Mine did not say it was overheating. That’s just what the dealer said from the ODB code.

I have a 2021 Gladiator EcoDiesel that experienced the high pressure fuel pump (HPFP) failure. Only saw (and sadly still "see") the issue going over the Interstate 8 grade from San Diego out to Glamis etc. (which is why I have a Jeep). Check engine light, service electronic throttle control...